Thread.yield() and Thread.sleep(), what's the difference

Folks'es,
can anyone enlighten me, as to the difference between yield() and sleep() in the Thread class?
i know, with sleep, one can specify the amount of time to sleep, but does that mean the thread yields for that amount of time?
if i use yield(), how long will my thread stop running?
any information is appreciated
thomas

Thread.yield() is used to give other threads a chance to get a processor time slice, according to the thread dispatcher rules. If there are no other threads ready to run, the current thread will gain the processor again.
Thread.sleep() will always release the processor for at least the amount of time specified, even if there are no other threads requesting it.

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